4x small cross head (JIS) screws - Careful, a standard Philips screwdriver will cam-out and damage the screws if not pushed in firmly while unscrewing !
Lid comes off easily.
Front right of PCB is a space for the Reset Switch (not fitted) marked 2SW4
Short Front Left - to - Front Right (either side of the + symbol in Pro+ photo)
Photo of Pro+ (very similar)
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